Molding-machine.



W. LEWIS.

MOLDING MACHINE.

APPLIUATIOR FILED AUG.17,1904.

Patented Feb. 22, 1910.

UNITED STATESPATENT ()FFICF.

WILFRED LEWIS, or PHILADELPHIA, PENNSYLVANIA. ASSIGNOR TO THE TALBORMANUFACTURING COMPANY, or CAMDEN, NEW JERSEY, A CORPORATION OF NEWJERSEY.

' MOLDING-MACHINE.

Specification of Letters Patent.

Application filed August. 17, 1904.

Patented Feb. 22, 1910.

Serial No. 220,991. i

To all whom it may concern:

Be it known that/I, \Vnmnnn LEWIS, a citizen of the United States ofAmerica, residing in the city and county of Philadelphia, in the Stateof Pennsylvania, have invented a certain new and useful Improve ment inMolding-h'lachines, of which the following is a true and exactdescription, reference being bad to the accompanying drawings, whichform a part thereof.

My invention relates to molding machines and has for its object. to)rovidc such machines and means whereby the relatively movable patternplates and flasks used in connection therewith shall be givenautomatically an initial parting movement of a very gradual kind merginginto a subsequently more rapid movement, thus imparting an increasedcapacity to the machine Without jeopardizing the accurac of the mold inthe flask.

My invention relates particularly to that class of molding machines inwhich movement is imparted to the movable part of a relatively movableflask and pattern plate through cylinders and pistons actuated throughpressure fluid and connected alternately with a source of such fluid andto exhaust, and, broadly speaking, my invention consists in applying tothe pressure con duit a choke "alve regulated in its movemcnts by themovement of the movable part and whereby the initial flow of pressurefluid to the actuating cylinders is made gradual and permitted toii'icrease after the gradual movement has insured a proper parting ofthe sand from the pattern.

Other features of my invention will be best understood as described inconnection with the drawings in which it is illustrated, and in which-Figure 1, is a plan view of a molding machine provided withmyimprovements. Fig. 2, a sectional elevation on the line 2-2 of Fig. 1.Fig. 3, a front view of the choke Valve mechanism, and Fig. 4, asectiopal view on the line 4 ---4, of Fig. 3. 1"

A, indicates the frame or housing of the molding machine, to the top ofwhich is secured the pattern plate B, around which extends the flaskframe, indicated at C, and as shown provided with projecting pins G,which secure the flask P, in proper position on the frame.

D, D, are cylinders secured to the frame A, and, as shown, made up oftwo cylinders on opposite sides of the Frame, though of course anynlunber of properly located r \g| indcrs could be used. I), I), indicatethe openings in the bottoms of these eydhulers for the entrance and exitof pressure fluid.

E, E, are plunger-s working in the cylinders .l), and secured to theflask frame 0.

F, indicates the conduit leading from a source of fluid underprcssi'u'e, not sluiwn, and conin'iun'rating through a valve l. with acontinuation F, of the pres ure pipe. F indicating'an exhaust passagewhich can be by action of the valve placed in counec tion with the pipeextension F.

G, is a cylinder connected with the pi 0, extension F, through a lateralopening 8, and with a further extension N, of the pressure pipe througha lateral opening G". The cylinder G, is also formed as shown withperforated guide lugs o, G", and with the laterally extending lug (1, bywhich it is secured to the bottom of the cylinder D.

H, is a plunger working in the cylinder G, and having a tapered cud H.To the upper end of the plunger is secured the head I, with dependingsand guard I, a spring .l, acting against a shoulder formed on thecylinder G. and against the head I, tending to brace the head andplunger ll, upward and increase the area of the pas sage through thecylinder (i. As shown, the sand guard I, has guide bolls K, K, securedto its lower edge and extending through the guide lugs G K, K,indicatlug binding nuts.

L. is a depending rod seci'u'ed to an extension of the frame (1, andresting on top of the head l as shown.

M. is a stop lug extendiu u over the head I, as already described, is anextension of the pressure pipe which ronnnunicalcs through branches N,and N, with the openings D, D, in the bottoms of the cylinders l).

0. indicates a pattern on the plate B; P, as already stated, is theflask, and Q, represents the sand mold in the flask.

'lhe parts being in the position shown in Fig. 2, the sand is packed inthe flask and around the pattern and when the mold is et'nnpletcd theoperator turns the valve F to admit the pressure fluid to th pipe cxtenstion F, the fluid passing through this pipe and the opening G, into thecylinder G, and

however, as these parts out of said cylinder through the opening .G,andpipe N, to the cylinder D, but on the opening of the valve the chokevalve piston H, H, is in its lowermost position leaving but a 5 smalltree passage through the cylinder G, so

clearance through the cylinder G, so that after the initial movement ofthe arts the rate of movement progressively an rapidly increases, givingthe machines the increased capacity due to the rapid movement, whileinsuring the most gradual parting of the mold from the pattern. Byarranging the check valve in the pressure conduit proper as shown I amable to properly regulate the flow of working fluid into and out of aplurality of cylinders by means of a sin le valve. Located as shown, thecheck va ve is readily accessible for repairs or adjustment whenevernecessary or desirable.

It will of course be understood that the machine illustrated anddescribed is simply instanced as an example of the application of myinvention, and that my claims are in no wise limited to the specificdetails of illustrated construction except where such details ofconstruction are referred to and made elements ofthe respective claims.

Having now described my in -ntion, what I claim as new and desire tosecure by Letters Patent is 1. In a molding machine having" :1relatively movable flask and pattern plate. and one or more cylindersand pistons for t'llCCling such relative movement, a conduit for fluidunder pressure leading to the actuating cylinders, in combination with:1 valve for connecting the cylinders with said conduit or to exhaust, acylinder G, situated in the pressure conduit, and connected theretothrough lateral openings G, G a plunger H, having a tapered end H,Workin in said cylinder, and means'moving with tie movaile art acting toregulate the position of the p un er in the cylinder G, so as to insurea gradua flow of pressure fluid to the actuating cylinders at theopening of the valve and permit an increased flow after the relativemovement of the parts begins.

2. In a molding machine having a fixed pattern plate and a flask movableto and from the same, the combination of one or more cylinders andpistons arranged to move the flask, a conduit for fluid under pressureleading to said cylinders, a valve arranged to connect the cylinderswith said conduit or to exhaust, a cylinder G, situated in the conduitand connecting therewith through, lateral openings G, G a piston H,having a tapered end H, Working in said cylinder, resilient means actingto raise, the plunger and a foot L, moving with the flask and acting toregulate the osition of the plunger in cylinder G, for t e purposespecified.

WILFRED LEWIS.

